Former US congresswoman Gabrielle Giffords provided the most emotional moment of the third night of the Democratic national convention.

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Giffords, who sustained brain damage after she was shot at an event with constituents in 2011, spoke during a segment on gun control. She said: 'Today, I struggle with speech but I have not lost my voice. America needs all of us to speak out, even when you have to fight to find the words.'

A spokesperson for Giffords said she spent 'countless hours' practising the speech, the longest she has delivered since the shooting.

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